n.覆羽（指蔽覆羽翮基部的羽毛）
The tegmentum —— tectum —— tegmentum connections are only concerned with the mid - dle and deep layers of the superior colliculus.
被盖—顶盖—被盖的联系只与上丘中、深层有关.
汉字吧hanzi8.com